Disk valve for rock drills



Juxfe 2l 1927.

, A. 1,633,471 l.. c. BAYLEs ET AL DIsx VALVE FOR nocx DRILLs Filed May27. 1925 laten w/@M THE/HT ORNEV cooperating with the Patented .lune 21,1927- UNITED STATES PATENT OFFICE..

LEWIS C. BAYLES AND FREI) M. SLATER, 0F EASTONQPENNSYLVANIA, ASSIGNORSTO INGERSOLL-RAND COMPANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION 0FNEW JERSEY.

DISK VALVE FOR ROCK DRILLS.

Application ltiled Hay 27, 1925. Serial No. 33,118.

This invention relates to fluid actuated rock drills, but moreparticularly to an improved oscillating disk valve construction capableof ready and convenient application to a rock drill having automaticrotation for the drill steel.

The objects of the invention are to enable an oscillating dislr valvelto be located rearwardly of the cylinder and around the rifle bar of therock drill, in Such location that the length of the drill is not.increased and no material weight is added to the drill.

The invention is illustrated in one of its preferred forms in theaccompanying drawings,'in which- Figure l is a. longitudinal sectionalelevation of a rock drill partly broken away showing the invention,

Figure 2 is a transverse sectional view -on the line 2-2 of Figure llooking upwardly in the direction of the arrows, the ports Y and Zunderneath the valve being shown in dot and dash lines to indicate theirshape and to show that they are in front of the section taken and arepresent in the construction but are not actually seen in Figure 2, and

Figure 3 is a detail transverse sectional view through the valve.

y Referring to the drawings, the cylinder A is provided with thereciprocating piston'B having the forward extension C extending throughthe front head washer D. The piston is provided with the usual rifle nutE rifle bar F for imparting rotation to the drill steel, which, togetherwith the front head and chuck parts are not shown for purposes ofsimplicity. The usual water tube G extends through the rifle bar andpiston, and the rifle bar is provided with the rotation ratchet H in theratchet ring J located in the block K. Located between the block K andthe cylinder head block L is a valve box preferably in two sections,comprising the ringO and the cover piece P, having a shallow recessbetween them within which recess the valve Q, is arranged. The back headR of the rock drill is of the usual construction and rovided with thethrottle valve S control ing the supply of pressure fluid to themachine. A sleeve T is preferably arran d overv the rifle "bar, and asshown, the va ve Q has ahollow central portion or bore U encircling therifle bar and sleeve T. This sleeve T is held wholly within the headblock L and cover piece P and centers the cover piece.

the valve to oscillate freely and also permit pressure fluid to low overthe periphery of the valve. The valve is guided in any suitable manneras by means of the pins WV extending into sockets Xin the valve in whichsuiiieient clearance is provided to permit oscillation. The cover pieceP is provided with an annular flange P concentric with the sleeve T andforming a stop for the valve. The cylinder head block L is provided withthe inlet ports Y and Z controlled only by the valve, and the cylinderis provided with the free exhaust port a controlled only by the piston.'A supply passage b connects the inlet port Z with the inlet port c atthe forward end of the cylinder and the inlet port Y communicatesdirectly with the rearward end of the cylinder. An inlet port d permitslive pressure fluid to pass from the throttle valve S to the. valvechest.

In the `operation of the device, assumingr that the piston B is movingrearwardly as indicated in Figure 1, the valve will be in the positionaS indicated and live pressure fluid is being admitted to the forwardend of the cylinder. After the piston has passed beyond and uncoveredthe exhaust port a in the cylinder, the pressure in the forward end ofthe cylinder and underneath one end of the valve will have fallen ordropped while the opposite end of the valve is subjected to compressiontaking place in the rearward end of the cylinder, which will cause thevalve to oscillate and close the inlet ort Z and o en the other inletport Y to 51e rear end 0E the c linder which will drive the pistonforward y.

The construction is simple, consumes a small amount of space, andpermits a "['lat diskv valve to be located around the rifle bar so that`there are no protuberances on the exterior of the cylinder. While theconstruction may be applied to any type of rock drill, the applicationis obvio-usly particularly suitable for a stope drill.

Te claim:

l. A fluid actuated rock drill comprising a cylinder and reciprocatingpiston, automatic rotation means for the drill steel including a riilebar, a head block having a valve seat port-ion, a valve box at the 'rearof the cylinder havinof a shallow recess forming a valve chamber, saidvalve box being provided with an annular flange forming a valve stop,and a fluid distributing plate valve in said shallow recess in the formof a thin ilat oscillating plate encircling the riile bar, the valvebeing uniformly tapered from its median diameter towards the peripheryat each side'and bearing on the seat portion of the headpiece along saiddiameter to form a fulcrum. y

2. A fluid actuated rock drill comprising .a cylinder and reciprocatingpiston. automatic rotation means for the drill steel including a riflebar, a free exhaust port located centrally of the cylinder andcontrolled only by the piston, a valve box having a shallow circularbore forming a valve chamber located rearwardly of thecylinder and inline there-with, said valve box being provided with an annular flangeformin a valve stop, a plate valve in the form o a thin flat oscillatingcircular disk in the said valve box recess and encircling the riflevvalve seat portion, a valve box at the rearl of the cylinder having ashallow recess frm,

ing a valve chamber, said valve box being provided with an'annularflange forming a valve stop, a sleeve around the rifle bar, said sleevebeing held wholly Within the head block and valve box and acting tocenter the valve box, and a fluid distributing plate valve in said valvebox recessin the form of a thin lat oscillating disk encircling saidsleeve, the fulcrum of said valve bearincr directly onsaid valve seatportion of the head piece. v

In testimony whereof we have signed this specification.

LEWIS c. BAYLES. FRED M. sLArER.

